(4)
Remove additional fuel tank access doors, if it is necessary, to get access to the housing of the measuring stick (AMM 28-11-02/401).
S 864-012
(5)
Go into the fuel tank (AMM 28-11-00/201). S 014-013
(6)
For housing No. 24, remove the spanwise beam access door, 131AZ (AMM 28-11-09/401).
S 034-015 CAUTION: BE CAREFUL WHEN YOU REMOVE THE HOUSING OF THE MEASURING STICK.
_______ THE HOUSING IS MADE OF FIBERGLASS MATERIAL AND CAN BE EASILY DAMAGED IF YOU BEND IT.
(7)
For housing No. 17, 19, 20, or 24 remove the clamp that holds the upper end of the housing.
S 034-016
(8)
Loosen the housing from the mounting base with a hex wrench. S 024-042
(9)
Lower the housing through the mounting base.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 034-043
(10)
Discard the O-ring.
S 034-017
(11)
Remove the spring pin that holds the upper float stop on the housing.
S 034-044
(12)
Remove the upper float stop and float from the housing.
S 024-018
(13)
Remove the housing from the fuel tank through the mounting base.
TASK 28-44-02-404-068
5. Fuel Measuring Stick Housing No. 17, 19, 20, 22 and 24 Installation___________________________________________________________________ (Fig. 401)
A. Consumable Materials
(1)
D00128 Petrolatum - Technical, VV-P-236
B.
References
(1)
AMM 28-11-00/201, Fuel Tanks
(2)
AMM 28-11-09/401, Spanwise Beam Access Door
(3)
AMM 28-44-01/401, Fuel Measuring Stick
(4)
AIPC 28-41-01 Fig. 1
C.
Access
(1)
Location Zones 131 Center Section Wing Box, Left 541 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 542 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 543 Outbd Main Tank (Part), Front Spar to Mid Spar, Left 551 Outbd Main Tank (Part), Front Spar to Mid Spar, Left 641 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 642 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 643 Outbd Main Tank (Part), Front Spar to Mid Spar, Right 651 Outbd Main Tank (Part), Front Spar to Mid Spar, Right
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(2)
Access Panels
131AZ Spanwise Beam Access Door
546BB Fuel Tank Access Door
552DB Fuel Tank Access Door
646BB Fuel Tank Access Door
652DB Fuel Tank Access Door
D.
Procedure
S 214-020
(1)
Examine the lower float stop.
S 964-057
(2)
Replace the lower float stop if it is damaged.
S 164-021
(3)
Clean the inner surface of the mounting base.
S 434-022
(4)
Install a new O-ring, lightly lubricated with petrolatum, on the farthest groove from the threads on the housing.
S 424-046
CAUTION: BE CAREFUL WHEN YOU INSTALL THE HOUSING OF THE MEASURING STICK.
_______ THE HOUSING IS MADE OF FIBERGLASS MATERIAL AND CAN BE EASILY DAMAGED IF YOU BEND IT.
(5) Put the housing through the mounting base from out of the fuel tank.
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